Hi Ed,

Underfill 1&2 after reflow would be my choice .
For seep in's >start< with dispensing folks
(still love camelots/speedo's/whatevernow) ;
as they did much more validations of various polymers we could ever do .

'm sure Alan reads this somewhere in Net abyss octopusy cave ;
just appear vulnerable and let him/'em pounce (do the work for you) .

if you have different gear , follow same recipe, in their interest to appear
solid .
Did good job for me (each possesses a discretely distributed "reco" list,
changes with evo)
Trust 'em (with caution)

pk

-----Original Message-----
From: Ed Hare [mailto:[log in to unmask]]
Sent: Wednesday, 16 February 2000 2:42
To: [log in to unmask]
Subject: [TN] Dbl-side BGA Assy


Hi all,

I have a couple questions regarding dbl-sided BGA assembly and underfill
...

1)  Would the process typically be ...
Reflow Side 1 > Underfill Side 1 > Reflow Side 2 > Underfill Side 2
or
Reflow Side 1 > Reflow Side 2 > Underfill Sides 1 & 2?

2)  Do any of you have a recommendation for underfill material(s) that
you use and work well?

Best regards,
Ed Hare
VM SEM Lab, Inc.

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